package pwgenerator

/*
	Has returns true if a CharSet contains char.

	char can be one of: Char, byte, rune, or a string (of length 1).
*/
func (c *CharSet) Has(char interface{}) (contains bool, err error) {

	var chkChar Char

	switch t := char.(type) {
	case Char:
		chkChar = t
	case byte:
		chkChar = Char(t)
	case rune:
		chkChar = Char(t)
	case string:
		if len(t) != 1 {
			err = ErrBadType
			return
		}
		chkChar = Char(t[0])
	default:
		err = ErrBadType
		return
	}

	for _, i := range *c {
		if chkChar == i {
			contains = true
			break
		}
	}

	return
}

// Len returns the length of a CharSet (needed for sort.Interface).
func (c *CharSet) Len() (l int) {

	l = len(*c)

	return
}

// Less returns true if item at index i is "less than" (sorts before) item at index j (needed for sort.Interface).
func (c *CharSet) Less(i, j int) (isBefore bool) {

	if (*c)[i] < (*c)[j] {
		isBefore = true
	}

	return
}

// RandChar returns a random character from a CharSet.
func (c *CharSet) RandChar() (char Char, err error) {

	var selectIdx int

	if selectIdx, err = saferRandInt(len(*c)); err != nil {
		return
	}

	char = (*c)[selectIdx]

	return
}

// String returns a string from a CharSet.
func (c *CharSet) String() (s string) {

	for _, i := range *c {
		s += string(i)
	}

	return
}

// Swap will swap the position of the item at index i and the item at index j in a CharSet (needed for sort.Interface).
func (c *CharSet) Swap(i, j int) {

	(*c)[j], (*c)[i] = (*c)[i], (*c)[j]

	return
}